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Analog Devices Inc. LT1787IMS8#PBF
- Part No.:
- LT1787IMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1787IMS8#PBF.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:299
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Product details
Overview
LT1787IMS8#PBF from Analog Devices (formerly Linear Technology) is a precision micropower high-side current sense amplifier designed for bidirectional sensing in battery-powered and industrial power monitoring systems. It features 8× fixed gain, ±40 µV typical input offset voltage, 12-bit dynamic range, 60 µA supply current, and operates from 2.5 V to 36 V total supply voltage. It delivers accurate current measurement across portable phones, battery-operated test equipment, and power management circuits.
For engineers reviewing the LT1787IMS8#PBF datasheet, LT1787IMS8#PBF pinout, LT1787IMS8#PBF application, or LT1787IMS8#PBF equivalent, key selection criteria include input offset stability over temperature, unidirectional/bidirectional output flexibility, FIL+/FIL– noise filtering capability, and MSOP-8 package compatibility with space-constrained PCB layouts.
Technical Context
The LT1787IMS8#PBF implements a matched resistor-based current mirror architecture with internal RG1A/RG2A (1.25 kΩ) gain-setting elements, enabling precise 8× differential-to-single-ended conversion without external gain components. Its input stage rejects common-mode voltages up to 36 V while maintaining ultralow offset drift (0.5–2 µV/°C).
It supports three operational modes: split-supply bipolar output (VBIAS = GND), single-supply bidirectional output (VBIAS externally biased), and unidirectional output (VBIAS = GND). Output is developed across an internal 20 kΩ ROUT, delivering VOUT = 8 × VSENSE + VBIAS ± VOUT(O), with VOUT swing limited to 30 mV above VEE and VS+ − 0.75 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.5 V to 36 V total (VS+ − VEE); enables direct integration into 3.3 V, 5 V, 12 V, and 24 V systems without level-shifting. |
| Input Offset Voltage (MS8) | ±125 µV max at 25°C; ±250 µV max over –40°C to 85°C - ensures ≤2 mA error in 5 A, 20 mΩ sense applications. |
| Fixed Gain | 8 V/V (±3% gain error); eliminates external gain resistors and reduces layout sensitivity to parasitic capacitance. |
| Supply Current | 60 µA typical; allows continuous operation in multi-year battery-powered devices such as portable meters and IoT sensors. |
| Dynamic Range | >12-bit (≥500 mV full-scale input with 40 µV offset); supports high-resolution current monitoring from µA-level leakage to 100 A peak. |
| PSRR | 120 dB min (VS supply); rejects ripple on high-side rail without additional filtering, critical in switching power supplies. |
| Operating Temperature | –40°C to +85°C (I-grade); qualified for industrial control, automotive body electronics, and telecom power modules. |
Pinout & Package
LT1787IMS8#PBF is housed in an 8-lead MSOP package (3 mm × 3 mm, 0.65 mm pitch), optimized for thermal performance (θJA = 250°C/W) and high-density layouts. Pin functions are validated per Linear Technology's official datasheet (1787fc) and functional diagram (Figure 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FIL+ (Pin 1) | Positive input filter terminal | Internally connected to midpoint of RG2A; used with FIL− to add RC low-pass filter (f−3dB = 1/(2π × 1.25 kΩ × C)) for high-frequency noise rejection. |
| VS− (Pin 2) | Negative sense input | Connects to low side of external RSENSE; sinks current proportional to negative sense voltage (VS+ < VS−); supplies bias current to internal amplifier. |
| DNC (Pin 3) | Do Not Connect | Internally connected; no external connection permitted - floating or tied to GND/VEE causes malfunction. |
| VEE (Pin 4) | Negative supply / ground reference | Serves as return path for internal current mirror; in single-supply mode, tied to system GND; sets lower VOUT limit (≥30 mV above VEE). |
| VOUT (Pin 5) | Current/voltage output | Delivers amplified, level-shifted output: VOUT = 8 × VSENSE + VBIAS ± VOUT(O); high-impedance node requiring buffering for ADC driving. |
| VBIAS (Pin 6) | Output bias reference | Defines zero-current output level; grounded for unidirectional mode; externally biased (e.g., 1.25 V) for bidirectional single-supply operation. |
| VS+ (Pin 7) | Positive sense input | Connects to high side of RSENSE; sources current proportional to positive sense voltage (VS+ > VS−); supports self-monitoring of supply current. |
| FIL− (Pin 8) | Negative input filter terminal | Internally connected to midpoint of RG1A; paired with FIL+ to implement differential input filtering without degrading CMRR. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional high-side sensing | Enables real-time charge/discharge monitoring in battery packs without shunt relocation or ground-loop disruption. |
| User-selectable external sense resistor | Supports RSENSE from 0.5 mΩ to 100 mΩ - balances resolution (low R) vs. power loss (high R) per application requirement. |
| Integrated FIL+/FIL− filtering | Eliminates need for external op-amp filters; 12.7 kHz cutoff with 0.01 µF capacitor suppresses PWM switching noise in motor drives. |
| Ultralow 60 µA quiescent current | Extends battery life in always-on monitoring nodes (e.g., smart battery gauges) without sacrificing accuracy or bandwidth. |
| 12-bit dynamic range with 40 µV offset | Resolves sub-mA currents in 10 A systems (e.g., 5 A @ 20 mΩ → 100 mV FS), enabling precision state-of-charge estimation. |
Applications
| Battery Charge/Discharge Monitoring | Industrial Power Supply Monitoring |
|---|---|
|
Use Scenario: Real-time tracking of Li-ion battery pack current during charging and discharging cycles in portable medical devices. IC Role / Device Role / Timing Role: High-side current sense amplifier providing bidirectional analog output referenced to VBIAS for microcontroller ADC sampling. Use Value: Enables accurate coulomb counting with ≤2 mA resolution using 20 mΩ shunt, supporting >99% state-of-charge accuracy over battery lifetime. |
Use Scenario: Continuous load current supervision in 24 V industrial PLC power rails with fast transient response. IC Role / Device Role / Timing Role: Precision current monitor interfaced to isolated sigma-delta ADC for fault detection and energy metering. Use Value: PSRR >120 dB rejects 120 Hz ripple from rectified AC input, eliminating false overcurrent trips during brownout conditions. |
| Portable Test Equipment | Automotive Body Control Module |
|
Use Scenario: Current profiling of DUTs in handheld multimeters and battery analyzers with dual-range capability. IC Role / Device Role / Timing Role: Micropower current sensor feeding buffered output to 12-bit SAR ADC for sub-µA leakage measurement. Use Value: 60 µA supply current allows >1000 h runtime on two AA cells; 12-bit dynamic range covers 1 µA to 10 A in single instrument. |
Use Scenario: Load current monitoring for LED headlight drivers and window motor controllers in 12 V vehicle systems. IC Role / Device Role / Timing Role: High-voltage-tolerant current amplifier operating directly from battery rail (up to 36 V) with integrated ESD protection. Use Value: Absolute max 40 V supply rating and –40°C to +85°C operation ensure reliability in under-hood environments with load dump transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4080TASA+ | Single-ended output only; 75 µV max offset; 2.7 V to 76 V supply; SO-8 package. | Lacks bidirectional output capability; requires external VBIAS circuitry for center-swing operation. | Select when unidirectional sensing suffices and higher supply voltage (76 V) is required beyond LT1787IMS8#PBF's 36 V limit. |
| INA240A1D | Zero-drift architecture; 5 µV max offset; 2.7 V to 80 V supply; 8-pin SOIC; 10x gain option. | Superior DC accuracy but higher quiescent current (2.4 mA); no built-in FIL+/FIL− filtering pins. | Select when ultra-low offset dominates design priority and board space permits external RC filtering for PWM noise suppression. |
Compared with MAX4080TASA+ and INA240A1D, the LT1787IMS8#PBF uniquely combines micropower operation (60 µA), integrated bidirectional output flexibility, and dedicated noise-filtering terminals - making it optimal for space- and energy-constrained portable and industrial monitoring where signal integrity and battery life are co-prioritized.
Availability
LT1787IMS8#PBF is available at Aetrix Electronics and suitable for battery monitoring, portable test equipment, and industrial power supply monitoring requiring stable component supply across extended product lifecycles.
Supply support for LT1787IMS8#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT1787IMS8#PBF belongs to Linear's precision current sense amplifier product line, engineered specifically for high-accuracy, low-power, high-common-mode-voltage current measurement in portable, industrial, and automotive systems.
FAQ
What is the maximum sense voltage range supported by the LT1787IMS8#PBF?
The LT1787IMS8#PBF supports a differential input sense voltage (VSENSE = VS+ − VS−) of ±500 mV full scale, with guaranteed linearity and gain accuracy. At ±128 mV input, the output delivers VBIAS ±1.024 V, enabling direct interface to 12-bit ADCs like the LTC1286. Input overload beyond ±10 V differential risks damage per absolute maximum ratings.
Can the LT1787IMS8#PBF operate from a single 3.3 V supply?
Yes - the LT1787IMS8#PBF operates from a total supply voltage of 2.5 V to 36 V (VS+ − VEE). With VEE = GND and VS+ = 3.3 V, it supports unidirectional sensing (VBIAS = GND) or bidirectional sensing (VBIAS = 1.25 V via LT1634). Minimum VOUT swing is 30 mV above VEE, ensuring valid output down to ~3.25 V headroom.
How does the FIL+ and FIL− functionality improve noise immunity in the LT1787IMS8#PBF?
FIL+ and FIL− connect internally to the midpoints of RG1A and RG2A (1.25 kΩ each), forming a differential RC low-pass filter. A capacitor between them sets f−3dB = 1/(2π × 1.25 kΩ × C); e.g., 0.01 µF yields 12.7 kHz. This attenuates high-frequency switching noise before amplification - critical in motor drives and DC-DC converters - without affecting CMRR.
What is the purpose of the DNC pin (Pin 3) on the LT1787IMS8#PBF?
Pin 3 is labeled DNC (Do Not Connect) and is internally connected within the LT1787IMS8#PBF die. It must remain unconnected - tying it to GND, VEE, or any other node may disrupt internal biasing, cause output errors, or damage the device. This pin has no user-accessible function and appears solely for package mechanical symmetry.
Does the LT1787IMS8#PBF support Kelvin (4-wire) sensing of the external shunt resistor?
Yes - the LT1787IMS8#PBF is explicitly designed for Kelvin connections to RSENSE. Its VS+ and VS− inputs have matched input impedance and low bias current (10–100 µA), minimizing errors from PCB trace resistance. Linear's datasheet recommends Kelvin routing in all but lowest-power applications to avoid ≥5% error from 0.5 mΩ interconnect resistance at 5 A.
LT1787IMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- -
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 40 µV
- Current - Supply:
- 60µA
- Current - Output / Channel:
- 50 µA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LT1787IMS8#PBF FAQ
1.How can I place an order for LT1787IMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1787IMS8#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LT1787IMS8#PBF reliable?
The price and inventory of LT1787IMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1787IMS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1787IMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1787IMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1787IMS8#PBF?
LT1787IMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1787IMS8#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LT1787IMS8#PBF?
For technical support, including LT1787IMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1787IMS8#PBF requirements.
6.How does Aetrix verify that LT1787IMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1787IMS8#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LT1787IMS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1787IMS8#PBF?
All LT1787IMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1787IMS8#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LT1787IMS8#PBF part is unused and in its original packaging.
Return procedure for LT1787IMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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